<template>
<div class="player" v-show="playlist.length>0">
  <transition name="normal" @enter="enter" @after-enter="afterEnter" @leave="leave" @after-leave="afterLeave" v-if="fullScreen">
    <div class="normal-player">
      <div class="background">
        <img width="100%" height="100%" :src="currentSong.image" />
      </div>
      <div class="top">
        <div class="back" @click="back">
          <i class="icon-back"></i>
        </div>
        <h1 class="title" v-html="currentSong.name"></h1>
        <h2 class="subtitle" v-html="currentSong.singer"></h2>
      </div>
      <div class="middle" @touchstart.prevent="middleTouchStart" @touchmove.prevent="middleTouchMove" @touchend="middleTouchEnd">
        <div class="middle-l" ref="middleL">
          <div class="cd-wrapper" ref="cdWrapper">
            <div class="cd" :class="cdCls">
              <img class="image" :src="currentSong.image" />
            </div>
          </div>
          <div class="playing-lyric-wrapper">
            <div class="playing-lyric">
              {{playingLyric}}
            </div>
          </div>
        </div>
        <scroll class="middle-r" ref="lyricList" :data="currentLyric && currentLyric.lines">
          <div class="lyric-wrapper">
            <div v-if="currentLyric">
              <p ref="lyricLine" class="text" :class="{'current': currentLineNum===index}" v-for="(line,index) in currentLyric.lines">{{line.txt}}</p>
            </div>
          </div>
        </scroll>
      </div>
      <div class=" bottom">
        <div class="dot-wrapper">
          <span class="dot" :class="{'active':currentShow==='cd'}"></span>
          <span class="dot" :class="{'active':currentShow==='lyric'}"></span>
        </div>
        <div class="progress-wrapper">
          <span class="time time-l">{{format(currentTime)}}</span>
          <div class="progress-bar-wrapper">
            <progressBar :percent="percent" @percentChange="onProgressBarChange"></progressBar>
          </div>
          <span class="time time-r">{{format(currentSong.duration)}}</span>
        </div>
        <div class="operators ">
          <div class="icon i-left " @click="changeMode">
            <i :class="iconMode"></i>
          </div>
          <div class="icon i-left ">
            <i @click="prev" class="icon-prev " :class="disableCls"></i>
          </div>
          <div class="icon i-center " :class="disableCls">
            <i @click="togglePlaying" :class="playIcon"></i>
          </div>
          <div class="icon i-right " :class="disableCls">
            <i @click="next" class="icon-next "></i>
          </div>
          <div class="icon i-right ">
            <i class="icon" @click="toggleFavorite(currentSong)" :class="getFavoriteIcon(currentSong)"></i>
          </div>
        </div>
      </div>
    </div>
  </transition>
  <transition name="mini" v-if="!fullScreen ">
    <div class="mini-player " @click="open">
      <div class="icon">
        <img :class="cdCls" width="40 " height="40 " :src="currentSong.image " />
      </div>
      <div class="text ">
        <h2 class="name " v-html="currentSong.name "></h2>
        <p class="desc " v-html="currentSong.singer "></p>
      </div>
      <div class="control">
        <progress-circle :radius="radius" :percent="percent">
          <i @click.stop="togglePlaying" :class="miniIcon" class="icon-mini"></i>
        </progress-circle>
      </div>
      <div class="control " @click.stop="showPlaylist">
        <i class="icon-playlist "></i>
      </div>
    </div>
  </transition>
  <playlist ref="playlist"></playlist>
  <audio ref="audio" :src="currentSong.url" @play="ready" @error="error" @timeupdate="updateTime" @ended="end"></audio>
</div>
</template>

<script type="text/ecmascript-6">
import ProgressBar from 'base/progress-bar/progress-bar'
import ProgressCircle from 'base/progress-circle/progress-circle'
import Scroll from 'base/scroll/scroll'
import Lyric from 'lyric-parser'
import Playlist from 'components/playlist/playlist'
import {
  playMode
} from 'common/js/config'
import {
  mapGetters,
  mapMutations,
  mapActions
} from 'vuex'
import animations from 'create-keyframe-animation'
import {
  prefixStyle
} from 'common/js/dom'
import {
  playerMixin
} from 'common/js/mixin'

const transform = prefixStyle('transform')
const transitionDuration = prefixStyle('transitionDuration')

export default {
  mixins: [playerMixin],
  data() {
    return {
      songReady: false,
      currentTime: 0,
      radius: 32,
      currentLyric: null,
      currentLineNum: 0,
      currentShow: 'cd',
      playingLyric: ''
    }
  },
  computed: {
    playIcon() {
      return this.playing ? 'icon-pause' : 'icon-play'
    },
    miniIcon() {
      return this.playing ? 'icon-pause-mini' : 'icon-play-mini'
    },
    cdCls() {
      return this.playing ? 'play' : 'play pause'
    },
    disableCls() {
      return this.songReady ? '' : 'disable'
    },
    percent() {
      return this.currentTime / this.currentSong.duration
    },
    ...mapGetters([
      'fullScreen',
      'playing',
      'currentIndex'
    ])
  },
  created() {
    this.touch = {}
  },
  methods: {
    back() {
      this.setFullScreen(false)
    },
    showPlaylist() {
      this.$refs.playlist.show()
    },
    end() {
      if (this.mode === playMode.loop) {
        this.loop()
      } else {
        this.next()
      }
    },
    loop() {
      this.$refs.audio.currentTime = 0
      this.$refs.audio.play()
      if (this.currentLyric) {
        this.currentLyric.seek(0)
      }
    },
    open() {
      this.setFullScreen(true)
    },
    enter(el, done) {
      const {
        x,
        y,
        scale
      } = this._getPosAndScale()

      let animation = {
        0: {
          transform: `translate3d(${x}px,${y}px,0) scale(${scale})`
        },
        60: {
          transform: `translate3d(0,0,0) scale(1.1)`
        },
        100: {
          transform: `translate3d(0,0,0) scale(1)`
        }
      }

      animations.registerAnimation({
        name: 'move',
        animation,
        presets: {
          duration: 400,
          easing: 'linear'
        }
      })

      animations.runAnimation(this.$refs.cdWrapper, 'move', done)
    },
    afterEnter() {
      animations.unregisterAnimation('move')
      this.$refs.cdWrapper.style.animation = ''
    },
    leave(el, done) {
      this.$refs.cdWrapper.style.transition = 'all 0.4s'
      const {
        x,
        y,
        scale
      } = this._getPosAndScale()
      this.$refs.cdWrapper.style[transform] = `translate3d(${x}px,${y}px,0) scale(${scale})`
      this.$refs.cdWrapper.addEventListener('transitionend', done)
    },
    afterLeave() {
      this.$refs.cdWrapper.style.transition = ''
      this.$refs.cdWrapper.style[transform] = ''
    },
    togglePlaying() {
      if (!this.songReady) {
        return
      }
      this.setPlayingState(!this.playing)
      if (this.currentLyric) {
        this.currentLyric.togglePlay()
      }
    },
    next() {
      if (!this.songReady) {
        return
      }
      if (this.playlist.length === 1) {
        this.loop()
        return
      } else {
        let index = this.currentIndex + 1
        if (index === this.playlist.length) {
          index = 0
        }
        this.setCurrentIndex(index)
        if (!this.playing) {
          this.togglePlaying()
        }
      }
      this.songReady = false
    },
    prev() {
      if (!this.songReady) {
        return
      }
      if (this.playlist.length === 1) {
        this.loop()
        return
      } else {
        let index = this.currentIndex - 1
        if (index === -1) {
          index = this.playlist.length - 1
        }
        this.setCurrentIndex(index)
        if (!this.playing) {
          this.togglePlaying()
        }
      }
      this.songReady = false
    },
    ready() {
      this.songReady = true
      this.savePlayHistory(this.currentSong)
    },
    error() {
      this.songReady = true
    },
    updateTime(e) {
      this.currentTime = e.target.currentTime
    },
    format(interval) {
      interval = interval | 0
      const minute = interval / 60 | 0
      const second = this._pad(interval % 60)
      return `${minute}:${second}`
    },
    onProgressBarChange(percent) {
      const currentTime = this.currentSong.duration * percent
      this.$refs.audio.currentTime = currentTime
      if (!this.playing) {
        this.togglePlaying()
      }
      if (this.currentLyric) {
        this.currentLyric.seek(currentTime * 1000)
      }
    },
    getLyric() {
      this.currentSong.getLyric().then((lyric) => {
        if (this.currentSong.lyric !== lyric) {
          return
        }
        this.currentLyric = new Lyric(lyric, this.handleLyric)
        if (this.playing) {
          this.currentLyric.play()
        }
      }).catch(() => {
        this.currentLyric = null
        this.playingLyric = ''
        this.currentLineNum = 0
      })
    },
    handleLyric({
      lineNum,
      txt
    }) {
      this.currentLineNum = lineNum
      if (lineNum > 5) {
        let lineEl = this.$refs.lyricLine[lineNum - 5]
        this.$refs.lyricList.scrollToElement(lineEl, 1000)
      } else {
        this.$refs.lyricList.scrollTo(0, 0, 1000)
      }
      this.playingLyric = txt
    },
    middleTouchStart(e) {
      this.touch.initiated = true
      const touch = e.touches[0]
      this.touch.startX = touch.pageX
      this.touch.startY = touch.pageY
    },
    middleTouchMove(e) {
      if (!this.touch.initiated) {
        return
      }
      const touch = e.touches[0]
      const deltaX = touch.pageX - this.touch.startX
      const deltaY = touch.pageY - this.touch.startY
      if (Math.abs(deltaY) > Math.abs(deltaX)) {
        return
      }
      const left = this.currentShow === 'cd' ? 0 : -window.innerWidth
      const offsetWidth = Math.min(0, Math.max(-window.innerWidth, left + deltaX))
      this.touch.percent = Math.abs(offsetWidth / window.innerWidth)
      this.$refs.lyricList.$el.style[transform] = `translate3d(${offsetWidth}px,0,0)`
      this.$refs.lyricList.$el.style[transitionDuration] = 0
      this.$refs.middleL.style.opacity = 1 - this.touch.percent
      this.$refs.middleL.style[transitionDuration] = 0
    },
    middleTouchEnd(e) {
      let offsetWidth
      let opacity
      if (this.currentShow === 'cd') {
        if (this.touch.percent > 0.1) {
          offsetWidth = -window.innerWidth
          opacity = 0
          this.currentShow = 'lyric'
        } else {
          offsetWidth = 0
          opacity = 1
        }
      } else {
        if (this.touch.percent < 0.9) {
          offsetWidth = 0
          this.currentShow = 'cd'
          opacity = 1
        } else {
          offsetWidth = -window.innerWidth
          opacity = 0
        }
      }
      const time = 300
      this.$refs.lyricList.$el.style[transform] = `translate3d(${offsetWidth}px,0,0)`
      this.$refs.lyricList.$el.style[transitionDuration] = `${time}ms`
      this.$refs.middleL.style.opacity = opacity
      this.$refs.middleL.style[transitionDuration] = `${time}ms`
    },
    _pad(num, n = 2) {
      let len = num.toString().length
      while (len < n) {
        num = '0' + num
        len++
      }
      return num
    },
    _getPosAndScale() {
      const targetWidth = 40
      const paddingLeft = 40
      const paddingBottom = 30
      const paddingTop = 80
      const width = window.innnerWidth * 0.8
      const scale = targetWidth / width
      const x = -(window.innnerWidth / 2 - paddingLeft)
      const y = window.innnerHeight - paddingTop - width / 2 - paddingBottom
      return {
        x,
        y,
        scale
      }
    },
    ...mapMutations({
      setFullScreen: 'SET_FULL_SCREEN'
    }),
    ...mapActions([
      'savePlayHistory'
    ])
  },
  watch: {
    currentSong(newSong, oldSong) {
      if (!newSong.id) {
        return
      }
      if (newSong.id === oldSong.id) {
        return
      }
      if (this.currentLyric) {
        this.currentLyric.stop()
      }
      clearTimeout(this.timer)
      this.timer = setTimeout(() => {
        this.$refs.audio.play()
        this.getLyric()
      }, 1000)
    },
    playing(newPlaying) {
      const audio = this.$refs.audio
      this.$nextTick(() => {
        newPlaying ? audio.play() : audio.pause()
      })
    }
  },
  components: {
    ProgressBar,
    ProgressCircle,
    Scroll,
    Playlist
  }
}
</script>

<style scoped lang="stylus" rel="stylesheet/stylus">
@import "~common/stylus/variable"
 @import "~common/stylus/mixin"

 .player
   .normal-player
     position: fixed
     left: 0
     right: 0
     top: 0
     bottom: 0
     z-index: 150
     background: $color-background
     .background
       position: absolute
       left: 0
       top: 0
       width: 100%
       height: 100%
       z-index: -1
       opacity: 0.6
       filter: blur(20px)
     .top
       position: relative
       margin-bottom: 25px
       .back
         position absolute
         top: 0
         left: 6px
         z-index: 50
         .icon-back
           display: block
           padding: 9px
           font-size: $font-size-large-x
           color: $color-theme
           transform: rotate(-90deg)
       .title
         width: 70%
         margin: 0 auto
         line-height: 40px
         text-align: center
         no-wrap()
         font-size: $font-size-large
         color: $color-text
       .subtitle
         line-height: 20px
         text-align: center
         font-size: $font-size-medium
         color: $color-text
     .middle
       position: fixed
       width: 100%
       top: 80px
       bottom: 170px
       white-space: nowrap
       font-size: 0
       .middle-l
         display: inline-block
         vertical-align: top
         position: relative
         width: 100%
         height: 0
         padding-top: 80%
         .cd-wrapper
           position: absolute
           left: 10%
           top: 0
           width: 80%
           height: 100%
           .cd
             width: 100%
             height: 100%
             box-sizing: border-box
             border: 10px solid rgba(255, 255, 255, 0.1)
             border-radius: 50%
             &.play
               animation: rotate 20s linear infinite
             &.pause
               animation-play-state: paused
             .image
               position: absolute
               left: 0
               top: 0
               width: 100%
               height: 100%
               border-radius: 50%

         .playing-lyric-wrapper
           width: 80%
           margin: 30px auto 0 auto
           overflow: hidden
           text-align: center
           .playing-lyric
             height: 20px
             line-height: 20px
             font-size: $font-size-medium
             color: $color-text-l
       .middle-r
         display: inline-block
         vertical-align: top
         width: 100%
         height: 100%
         overflow: hidden
         .lyric-wrapper
           width: 80%
           margin: 0 auto
           overflow: hidden
           text-align: center
           .text
             line-height: 32px
             color: $color-text-l
             font-size: $font-size-medium
             &.current
               color: $color-text
     .bottom
       position: absolute
       bottom: 50px
       width: 100%
       .dot-wrapper
         text-align: center
         font-size: 0
         .dot
           display: inline-block
           vertical-align: middle
           margin: 0 4px
           width: 8px
           height: 8px
           border-radius: 50%
           background: $color-text-l
           &.active
             width: 20px
             border-radius: 5px
             background: $color-text-ll
       .progress-wrapper
         display: flex
         align-items: center
         width: 80%
         margin: 0px auto
         padding: 10px 0
         .time
           color: $color-text
           font-size: $font-size-small
           flex: 0 0 30px
           line-height: 30px
           width: 30px
           &.time-l
             text-align: left
           &.time-r
             text-align: right
         .progress-bar-wrapper
           flex: 1
       .operators
         display: flex
         align-items: center
         .icon
           flex: 1
           color: $color-theme
           &.disable
             color: $color-theme-d
           i
             font-size: 30px
         .i-left
           text-align: right
         .i-center
           padding: 0 20px
           text-align: center
           i
             font-size: 40px
         .i-right
           text-align: left
         .icon-favorite
           color: $color-sub-theme
     &.normal-enter-active, &.normal-leave-active
       transition: all 0.4s
       .top, .bottom
         transition: all 0.4s cubic-bezier(0.86, 0.18, 0.82, 1.32)
     &.normal-enter, &.normal-leave-to
       opacity: 0
       .top
         transform: translate3d(0, -100px, 0)
       .bottom
         transform: translate3d(0, 100px, 0)
   .mini-player
     display: flex
     align-items: center
     position: fixed
     left: 0
     bottom: 0
     z-index: 180
     width: 100%
     height: 60px
     background: $color-highlight-background
     &.mini-enter-active, &.mini-leave-active
       transition: all 0.4s
     &.mini-enter, &.mini-leave-to
       opacity: 0
     .icon
       flex: 0 0 40px
       width: 40px
       padding: 0 10px 0 20px
       img
         border-radius: 50%
         &.play
           animation: rotate 10s linear infinite
         &.pause
           animation-play-state: paused
     .text
       display: flex
       flex-direction: column
       justify-content: center
       flex: 1
       line-height: 20px
       overflow: hidden
       .name
         margin-bottom: 2px
         no-wrap()
         font-size: $font-size-medium
         color: $color-text
       .desc
         no-wrap()
         font-size: $font-size-small
         color: $color-text-d
     .control
       flex: 0 0 30px
       width: 30px
       padding: 0 10px
       .icon-play-mini, .icon-pause-mini, .icon-playlist
         font-size: 30px
         color: $color-theme-d
       .icon-mini
         font-size: 32px
         position: absolute
         left: 0
         top: 0

 @keyframes rotate
   0%
     transform: rotate(0)
   100%
     transform: rotate(360deg)
</style>
